Alongside heralded astronauts like Charlie Duke, Joseph Engle, and Bruce McCandless, James B. Irwin was a product of NASA's Astronaut Group 5 in April 1966.
Only two months following his selection, Irwin would serve as a member of the astronaut support crew for Apollo 10, the mission that served as a dry run for the first manned Moon landing. Irwin would also serve as the backup lunar module pilot for the Apollo 12 mission that would land on the Moon.
Irwin would have his opportunity to walk on the lunar surface when he would become Lunar Module Pilot as part of the Apollo 15 crew in 1971. As the first J-Mission, Apollo 15's crew were required to receive rigorous geological training to meet the demands of a more science-focused mission profile. This profile meant the crew would spend more time on the lunar surface than previous missions to allow for three EVAs (over 18 hours in total). During this time, Irwin would not only become the 8th human to walk on the Moon, but also would become the first automobile passenger as Commander David Scott drove the Lunar Roving Vehicle (LRV) across the lunar surface for the first time.
Sadly, James Irwin would pass away on August 8th, 1991, becoming the first of the 12 men to walk on the Moon to pass away.
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